Ashwagandha dosage in clinical studies
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Ashwagandha Dosage in Clinical Studies: Key Findings
Dosage Ranges Used in Clinical Trials for Stress, Anxiety, and Sleep
Clinical studies have tested a variety of ashwagandha dosages, most commonly ranging from 120 mg to 600 mg per day, with some studies using even higher doses for specific conditions. For stress and anxiety, several trials have shown benefits at daily doses of 125 mg, 240 mg, 250 mg, 300 mg, and 600 mg, typically administered for 6 to 8 weeks. For example, one study found significant reductions in stress and anxiety with both 250 mg and 600 mg per day of ashwagandha root extract, taken in divided doses (twice daily) over eight weeks . Another study confirmed that ashwagandha extract at 125 mg, 250 mg, and 500 mg per day for 8 weeks safely reduced mild to moderate chronic stress, with even the lowest dose (125 mg/day) showing clinical benefits . A systematic review and meta-analysis also found that ashwagandha supplementation reduced anxiety and stress, with favorable effects observed at doses between 300–600 mg per day .
For sleep quality, a 6-week study used 120 mg of standardized ashwagandha extract once daily and reported significant improvements in sleep quality and related measures . Another trial used 240 mg daily for 60 days and found reductions in anxiety and stress, as well as improvements in hormonal markers .
Dosage in Other Health Conditions
In studies focused on arthritis, dosages of 500–1000 mg per day in capsule form or 6 grams in powder form, taken for 8–12 weeks, were commonly used and found to be potentially beneficial for managing symptoms . For elderly populations with frailty, 600 mg per day (300 mg twice daily) of ashwagandha root extract for 8 weeks led to significant improvements in frailty scores, sleep quality, and cognitive function, with good safety and tolerability .
Pharmacokinetics and Formulation Considerations
Pharmacokinetic studies have compared different ashwagandha extract formulations, such as sustained-release capsules and extracts with varying withanolide content. These studies typically used single doses of 300 mg or doses normalized to specific withanolide content (e.g., 185 mg total withanolides per dose) to assess absorption and bioavailability 45. The findings suggest that formulations with higher withanolide glycoside content may offer better bioavailability, potentially allowing for lower effective doses .
Cognitive and Mood Effects in Healthy Adults
For cognitive and mood benefits in healthy young adults, a study used 225 mg per day of a liposomal ashwagandha root and leaf extract for 30 days, reporting improvements in memory, attention, and mood .
Safety and Tolerability
Across these studies, ashwagandha was generally well tolerated, with no significant adverse effects reported at the tested dosages, which ranged from 120 mg to 1000 mg per day for periods of 6 to 12 weeks 1237+2 MORE.
Conclusion
Clinical studies on ashwagandha most commonly use daily doses between 120 mg and 600 mg, with some conditions warranting up to 1000 mg per day. Benefits for stress, anxiety, sleep, cognitive function, and frailty have been observed at these doses, with good safety profiles. Lower doses (as low as 120–125 mg/day) can be effective for stress and sleep, while higher doses (300–600 mg/day) are often used for broader health benefits. Formulation and withanolide content may influence the effective dose needed.
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Most relevant research papers on this topic
Adaptogenic and Anxiolytic Effects of Ashwagandha Root Extract in Healthy Adults: A Double-blind, Randomized, Placebo-controlled Clinical Study
Ashwagandha root extract effectively reduces stress and anxiety in healthy adults, with improved sleep quality.
Analysis of Clinical Trial Registry of India for Evidence of Anti-Arthritic Properties of Withania somnifera (Ashwagandha).
Ashwagandha, when taken in a dosage of 6gm in powder form or extracts for 8-12 weeks, may help manage arthritis symptoms in patients.
A comparative pharmacokinetics study of Ashwagandha (Withania somnifera) Root Extract sustained-release capsules: an open-label, randomized, two treatment, two-sequence, two period, single-dose crossover clinical study
Ashwagandha root extract sustained-release capsules provide longer therapeutic effects from a single daily dose, with higher absorption, better bioavailability, and longer elimination half-life compared to reference products.
Pharmacokinetics and bioequivalence of Withania somnifera (Ashwagandha) extracts – A double blind, crossover study in healthy adults
WS-35, with 35% withanolide glycosides, has a 280.74 times higher bioavailability of total withanolides than WS-2.5, making it a promising candidate for further studies on Ashwagandha.
Does Ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta‐analysis of randomized controlled trials
Ashwagandha supplementation significantly reduces anxiety and stress levels compared to placebo, but further high-quality studies are needed to confirm its clinical efficacy.
An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract
Ashwagandha supplementation significantly reduces anxiety and stress in adults, potentially through its effect on the hypothalamus-pituitary-adrenal axis.
Acute and Repeated Ashwagandha Supplementation Improves Markers of Cognitive Function and Mood
Ashwagandha supplementation (225 mg) may improve memory, attention, vigilance, and executive function while decreasing perceptions of tension and fatigue in younger healthy individuals.
A randomized, double blind, placebo controlled study to evaluate the effects of ashwagandha (Withania somnifera) extract on sleep quality in healthy adults.
Ashwagandha extract supplementation for six weeks significantly improved sleep quality and overall well-being in healthy adults with non-restorative sleep, with no reported adverse events.
An 8-Week Oral Therapy with Ashwagandha (Withania Somnifera) Root Extract (600 mg/day) Improves Frailty and Quality of Life in Elderly: A Prospective, Randomized, Placebo-Controlled, Efficacy and Safety Study
Ashwagandha root extract (600 mg/day) significantly improves frailty and quality of life in elderly individuals after 8 weeks of treatment, with no adverse effects or changes in hepatic and renal parameters.
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